More info:
The garrison carrier carries troops into any battle area. The transparent cones on top are missles that reload relatively fast. The reason why it is called a garrison troop carrier is that the at-te seats fit ontop, making it able to carry MORE troops, making it a garrison of troops. This carrier first made its appearence in the battle of beta 1. It has the best troop carrier protection. Also, the things attached to the cockpit's bars on front are also guns.